Uintah Machine builds a line of MSHA Part 31 permissible diesel powered coal haulers. Patterned somewhat after the old Jeffrey 4114, but there are so many improvements that there really isn’t much to compare.  We use a Cummins engine package of 180HP, Clark transmission, Uintah Machine built transfer gear case, John Deere differentials with inboard wet disk brakes, and a beefy slewing bearing articulation. There is nothing to compare on the market today.